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Release 4.14 drivers/macintosh/windfarm_lm75_sensor.c

/*
 * Windfarm PowerMac thermal control. LM75 sensor
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/i2c.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/pmac_low_i2c.h>

#include "windfarm.h"


#define VERSION "1.0"


#undef DEBUG

#ifdef DEBUG

#define DBG(args...)	printk(args)
#else

#define DBG(args...)	do { } while(0)
#endif


struct wf_lm75_sensor {
	
int			ds1775 : 1;
	
int			inited : 1;
	
struct i2c_client	*i2c;
	
struct wf_sensor	sens;
};

#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)


static int wf_lm75_get(struct wf_sensor *sr, s32 *value) { struct wf_lm75_sensor *lm = wf_to_lm75(sr); s32 data; if (lm->i2c == NULL) return -ENODEV; /* Init chip if necessary */ if (!lm->inited) { u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1); DBG("wf_lm75: Initializing %s, cfg was: %02x\n", sr->name, cfg); /* clear shutdown bit, keep other settings as left by * the firmware for now */ cfg_new = cfg & ~0x01; i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new); lm->inited = 1; /* If we just powered it up, let's wait 200 ms */ msleep(200); } /* Read temperature register */ data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0)); data <<= 8; *value = data; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt139100.00%1100.00%
Total139100.00%1100.00%


static void wf_lm75_release(struct wf_sensor *sr) { struct wf_lm75_sensor *lm = wf_to_lm75(sr); kfree(lm); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt26100.00%1100.00%
Total26100.00%1100.00%

static const struct wf_sensor_ops wf_lm75_ops = { .get_value = wf_lm75_get, .release = wf_lm75_release, .owner = THIS_MODULE, };
static int wf_lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct wf_lm75_sensor *lm; int rc, ds1775 = id->driver_data; const char *name, *loc; DBG("wf_lm75: creating %s device at address 0x%02x\n", ds1775 ? "ds1775" : "lm75", client->addr); loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL); if (!loc) { dev_warn(&client->dev, "Missing hwsensor-location property!\n"); return -ENXIO; } /* Usual rant about sensor names not beeing very consistent in * the device-tree, oh well ... * Add more entries below as you deal with more setups */ if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY")) name = "hd-temp"; else if (!strcmp(loc, "Incoming Air Temp")) name = "incoming-air-temp"; else if (!strcmp(loc, "ODD Temp")) name = "optical-drive-temp"; else if (!strcmp(loc, "HD Temp")) name = "hard-drive-temp"; else if (!strcmp(loc, "PCI SLOTS")) name = "slots-temp"; else if (!strcmp(loc, "CPU A INLET")) name = "cpu-inlet-temp-0"; else if (!strcmp(loc, "CPU B INLET")) name = "cpu-inlet-temp-1"; else return -ENXIO; lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL); if (lm == NULL) return -ENODEV; lm->inited = 0; lm->ds1775 = ds1775; lm->i2c = client; lm->sens.name = name; lm->sens.ops = &wf_lm75_ops; i2c_set_clientdata(client, lm); rc = wf_register_sensor(&lm->sens); if (rc) kfree(lm); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt21873.90%457.14%
Étienne Bersac4515.25%114.29%
Jean Delvare3210.85%228.57%
Total295100.00%7100.00%


static int wf_lm75_remove(struct i2c_client *client) { struct wf_lm75_sensor *lm = i2c_get_clientdata(client); DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name); /* Mark client detached */ lm->i2c = NULL; /* release sensor */ wf_unregister_sensor(&lm->sens); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt4996.08%150.00%
Jean Delvare23.92%150.00%
Total51100.00%2100.00%

static const struct i2c_device_id wf_lm75_id[] = { { "MAC,lm75", 0 }, { "MAC,ds1775", 1 }, { } }; MODULE_DEVICE_TABLE(i2c, wf_lm75_id); static struct i2c_driver wf_lm75_driver = { .driver = { .name = "wf_lm75", }, .probe = wf_lm75_probe, .remove = wf_lm75_remove, .id_table = wf_lm75_id, }; module_i2c_driver(wf_lm75_driver); MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt58481.11%550.00%
Jean Delvare8812.22%220.00%
Étienne Bersac456.25%110.00%
Wei Yongjun20.28%110.00%
Julia Lawall10.14%110.00%
Total720100.00%10100.00%
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